{
  "bibcode": "2010GCN.10553....1G",
  "body": "S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,\nP. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf\nof the Konus-Wind team, report:\n\nThe long intense GRB 100322A (Fermi/GBM trigger #290912711,\nvan der Host et al., GCN 10539) triggered Konus-Wind\nat T0=03905.772s UT (01:05:05.772)\n\nThe burst light curve shows a complex structure containing\ntwo main pulses with a total duration of ~50 s.\nAdditionally, a much weaker pulse was observed around T0+75s.\n\nThe first of the two main pulses has a distinctly softer spectrum\nthan the second one. No evident spectral evolution was detected\nwithin the pulses.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB100322_T03905/\n\nAs observed by Konus-Wind the burst\nhad a fluence of 7.3(+/-0.5)x10-5 erg/cm2,\nand a 256-ms peak flux measured from T0+31.744s\nof 6.5(+/-0.4)x10-6 erg/cm2/s\n(both in the 20 keV - 5 MeV energy range).\n\nThe spectrum of the first, softer pulse\n(measured from T0 to T0+16.384 s) is well fitted\nin the 20 keV - 5 MeV range by a power law\nwith exponential cutoff model, for which\nalpha = -0.86(+/-0.15),\nand Ep = 150(-10, +12) keV (chi2 = 72/74 dof).\n\nThe spectrum of the second, harder part of the burst\n(from T0+16.384 to T0+45.568 s) is also well fitted\nin the 20 keV - 5 MeV range by a power law\nwith exponential cutoff model, for which\nalpha = -0.99(+/-0.06),\nand Ep = 610(-62, +75) keV (chi2 = 77/74 dof).\n\nThe spectrum at the maximum count rate\n(measured from T0+31.744 to T0+37.376 s) is well fitted\nin the 20 keV - 5 MeV range by a power law\nwith exponential cutoff model, for which\nalpha = -0.92(+/-0.07),\nand Ep = 707(-70, +82) keV (chi2 = 72/74 dof).\n\nAll the quoted results are preliminary.\nAll the quoted errors are at the 90% confidence level.",
  "circularId": 10553,
  "createdOn": 1269954013000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 100322A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 100322A"
}